A man charged with killing his wife and two stepchildren may have been motivated by her affair with a colleague whom she planned to run away with.

Luis Toledo has been charged with the murder of wife Yesenia Suarez, 28, and his stepson and daughter in Deltona, Florida. New documents this week revealed that Toledo had found out that his wife was having an affair with a co-worker.

Ms Suarez and her two children, eight-year-old Michael Otto and Thalia, nine, vanished last October. Toledo has refused to say what he did with Ms Suarez's body and denies killing the children.